Burglar-alarm.



J. JONES, JR. BURGLAR ALARM.

APPLICATION IILED mm, 1912.

15,830. Patented Nov. 3,- 191 i 2 snnms-snnnr 1. W].

THE NORRIS PETERS Co. PHOTO-LITHO.. WASHINGTON. n c

J. JONES, JR. BURGLAB ALARM. 1 APPLICATION FILED JAN.'13| 1912. 1,1 15.830. Patented Nov. 3, 1914.

2 SHEETS-SHEET 2.

THE NORRIS PETERS C0,. PHOm-LITHCL. WASHINURJN. u. u

UNITED snares PAEENT OFFICE. l

JAMES JONES, an, or nnwxoR-K, N. Y.

'BUEGLAR-ALARM.

To all whom it may concern:

Be it known that I, JAMES JONES, J r. of the city of New York, in the county of Kings and'State of New York, haveinvented oerpensive devi'ce composed of but few parts and hence not likely to get out of order, and which will be positive in its action and not likely to be operated accidentally.

In the drawing Figure 1 is an elevation of an alafm constructed in accordance with my invention. Fig. 2 is an end view showing the position of the parts when the door is open. Fig. 3 is a similar view wlth the door closed. Fig. 4% shows the alarm sounded.

Figs. 5, 6 and 7 show top plan views of the parts in the positions illustrated in Figs. 2, 3, and 41, respectively. Fig. 8 is a diagram of the electric circuit. v

Referring to the drawing, 1 designates a box adapted to be secured to a door at the top of the latter and equipped with hooks 2 by which it may be secured. This box'contains a battery and carries a suitable signal, as a hell. I

At 3 I have shown the box provided with a presser foot which is normally held advanced by the tension of a spring 4. In its advanced position the presser foot extends beyond the box and is adaptedto contact with a door frame when the door is closed and thus retract the presser foot against the tension of the spring.

At 5 I have shown a suitable bearing plate for the presser foot and the latter is formed at its inner end with a reduced portion 6 thus providing a shoulder 7 and an extremity 8.

The circuit closing element is shown at 10. This preferably consists of a weighted sleeve freely movable on a vertical rod 12 supported by the box 1. This rod, preferably at its top, is in circuit with the battery. (See Fig. 8.) A plate 13 is shown attached to the front of the box and this plate is also in circuitwith the battery and has a free end 14 normally lying adjacent the rod 12.

I have shown the circuit closer 10 formed with a laterally projecting flange 15 and the top of the box with a keeper plate 16 having Specification of Letters Patent. P ig fl'lg d NOV. 31911L Application filed January 13, 1912. Serial No. 671,064.

that when the flange 15 is placed outside of path of movement of the presser foot.

When the alarm is not in use 0r its .use is verticzil flanges 17 and 18. Flange 18 extends diagonally across the topof the box: at the corner adjacent the presser fo0t'3 so not desired theflange 15 lies between the flanges 17 and18,.as in dotted lines, Fig. 5.

to the position shown inFigs. 4 and'S, thus closing the circuit by contact with extremity 14-. of plate 13 and causes the alarm to sound, the .alarm continuing until the circuit is broken. I I t i To set the alarm theflange 15 is placed W: hen the circuit closer is set for use and is trippedby the presser foot it falls by gravity across "the corner of the box outside of flange l8 of the keeper plate. (See Fig. 5.) The occupant of the room or apartment equipped with theala'rm may set it before going out so thatthealarm will be operated if the door should be opened inhis absence and still permit hin to leave without causing the alarm to sound. To do this the door may be either open or closed when the circuit closer 10 is placed with its flange 15 extending in the path of the presser foot. If the door is open, as in Figs. 2 and 5, the flange rests upon the corner of the box and out'of contact with the presser foot but in the path of movement of shoulder 7. The occupant of the premises may then pass out of the door and close it. This causes the presser foot to move inward and the shoul dotted lines, Fig. 6, and as the occupant opens the door and passes out the flange 15 will fall from this shoulder on to the top of the box, as in Figs. 2 and 5, and when the occupant closes the door behind him the flange 15 will fall upon the part 6 of the presser foot as in Figs. 3 and 6, as before described.

When the occupant of the premises is within and it is desired that the alarm be sounded at the first opening of the door the latter is closed and then the circuit closer is placed so that it is supported only by the flange 15 resting upon the extremity 6 of the presser foot. (See Fig. 6.) When thus set the first operation of opening the door results in sounding the alarm.

I claim as my invention 1. In an electric alarm for doors and the -like, the combination with the box having an electric battery and a suitable signal, and having a guide in electrical connection with said battery, and a contact member also in electrical connection with said battery and lying adjacent said guide, of a gravitating circuit closer freely movable 011 said guide,

, means for normally supporting said circuit closer out of engagement with said contact member, and means operated by the opening of the door for removing said supporting means from said circuit closer and allowing it to fall and form a connection between said guide and said contact member.

2. In an electric alarm for doors and the like, the combination with the box having an electric battery and a signal and having a vertically disposed rod secured thereto, said rod being in electrical connection with said battery, and a contact plate having a free end adjacent said rod, of a weighted sleeve movable on said rod, means for supporting said sleeve near the top of said rod, and means operated by the opening of the door for unseating said sleeve and causing it to fall into contact with said plate.

3. In an electric alarm for doors and the like, the combination with the normally open electric circuit having contacts, one of said contacts consisting of a vertically disposed rod, and the other contact being near the lower end of said rod, of a weighted sleeve normally supported near the top of said rod, and means rendered efiective by the opening of the door for unseating said sleeve and causing it to fall and establish a connection between said contacts.

l. In an electric alarm for doors and the like, the combination with the box or casing having a normally open circuit and contacts, of a weighted sleeve having a lateral flange movable on one of said contacts, means for normally supporting said flange, of a presser foot rendered effective upon opening the door to remove sa d supporting means from said flange and cause said sleeve to fall by gravity to connect said contacts.

5. In an electric alarm for doors and the like, the combination with the box having a spring actuated presser foot adapted to engage a door frame and be retracted when the door is closed, said box having a normally open electric circuit, of a gnavitating element and means for normally supporting the same in position to be unseated by the action of said presser foot to close said contacts.

In testimony whereof, I have signed this specificat on in the presence of two subscrib- Copies of this patent may be obtained for five cents each, hy a gldressing the "Commissioner of Patents,

Washington, D. (2. 

